Objective
The project is dedicated to theoretical and experimental studies of new types of magnetic phase transitions caused by the presence of a magnetic instability (a field induced change in the magnetic state) in one or two magnetic sublattices in various ferrimagnets.
The theory of ferrimagnets with one or more unstable sublattices will be given in the exchange model in the scope of the molecular field approximation. The crystal field effects as well as magnetic clustering will also be considered. The theory will be applied to two kinds of magnetic instability: itinerant electron metamagnetism in rare earth intermetallic compounds and crossover-like transitions in rare-earth iron garnets.
The experimental programme implies the study of magnetisation and magnetostriction in high magnetic fields up to 60 T. The ferromagnetic resonance technique up to 50 T will also be applied for rare earth iron garnets.
By using the substitution method appropriate compositions, in which the new type of magnetic phase transitions can be observed, will be prepared. As model materials for investigations mainly the rare-earth - Co intermetallic compounds with 1:2 and 1:3 stoichiometries, in which the magnetic instability of the itinerant electron metamagnetism- type has been observed, will be used. A search of other Co- and Ni-based intermetallics, which can show a magnetic instability, will also be performed.
Some Y-Tb and Y-Ho iron garnets, in which a crossover-like magnetic instability exists, will be studied with the aim to observe the new type of magnetic phase transitions.
Numerical calculation will accompany the experiments in all the stages in order to verify the validity of the theory as well as to determine the basic parameters of the materials studied.
Topic(s)
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1018 XE Amsterdam
Netherlands